#!/usr/bin/env bash
#
# platform/config/bin/vic-log-uploader
#
# Victor Log Uploader
#
# This script runs as a background to periodically check for outgoing files
# and attempt to upload them by calling 'vic-log-upload'. Outgoing files will be
# deleted after successful upload.
#
# File names ending with '~' are ignored as temporary files.
# Only regular files will be uploaded. Directories and special files will be ignored.
#
# Default configuration values may be overridden by environment.
# When run from vic-log-uploader.service, environment values may
# be set in /anki/etc/vic-log-uploader.env.
#

: ${VIC_LOG_UPLOADER_FOLDER:="/data/data/com.anki.victor/cache/outgoing"}
: ${VIC_LOG_UPLOADER_SLEEP_SEC:=30}
: ${VIC_LOG_UPLOADER_QUOTA_MB:=10}
: ${VERBOSE:=0}

# Helper programs
LOGGER="/bin/logger -t vic-log-uploader"
UPLOADER="/anki/bin/vic-log-upload"

#
# Log helpers
#

function log () {
  ${LOGGER} -p user.info -- "$*"
}

function loge () {
  ${LOGGER} -p user.err -- "$*"
}

function logv () {
  if [ ${VERBOSE} -eq 1 ]; then
    ${LOGGER} -p user.debug -- "$*"
  fi
}

#
# Return usage of given folder, counted in MB
#
function get_usage_mb () {
    usage_mb=$(/bin/du -m "$1")
    usage_mb=${usage_mb/[^0-9]*/}
    echo "${usage_mb}"
}

/bin/mkdir -p ${VIC_LOG_UPLOADER_FOLDER}

while :
do
  # Go through all the files we haven't uploaded
  shopt -s nullglob
  for i in "${VIC_LOG_UPLOADER_FOLDER}"/*
  do
    if [[ "${i}" == *~ ]] ; then
      logv "Ignore temporary file ${i}"
    elif [ ! -f "${i}" ] ; then
      logv "Ignore special file ${i}"
    else
      # Upload anything else
      log "${UPLOADER} ${i}"
      ${UPLOADER} "${i}"
      if [ $? -eq 0 ] ; then
        log "/bin/rm -f ${i}"
        /bin/rm -f "${i}"
      fi
    fi
  done
  shopt -u nullglob

  #
  # Remove oldest files to stay within disk quota.
  # Temporary files are counted against quota and may be removed to free space.
  # Directories and special files are counted against quota and may be removed to free space.
  #
  usage_mb=$(get_usage_mb ${VIC_LOG_UPLOADER_FOLDER})
  while [ ${usage_mb} -gt ${VIC_LOG_UPLOADER_QUOTA_MB} ]; do
    log "Usage ${usage_mb} MB is over quota ${VIC_LOG_UPLOADER_QUOTA_MB} MB"
    oldest=$(/bin/ls -1tr ${VIC_LOG_UPLOADER_FOLDER} | /bin/head -1)
    log "/bin/rm -rf ${oldest}"
    /bin/rm -rf "${oldest}"
    usage_mb=$(get_usage_mb ${VIC_LOG_UPLOADER_FOLDER})
  done

  logv "sleep ${VIC_LOG_UPLOADER_SLEEP_SEC}"
  sleep ${VIC_LOG_UPLOADER_SLEEP_SEC}

done